As an Irishman I can safely say that Cromwell still impacts on the psyche of Ireland 😉 - I think however Jeorg's point is that some events leave such a scar on a culture that it defines them for many generations. The Dragonkill War was so cataclysmic it was bound have left it's mark deep in the DNA of Genertela

You missed d101 Games' OQ supplement, River of Heaven. Luther Arkwright (also TDM/Mythras) is sci-fi. And there's a bit more in Chaosium's Monographs (including the Icarus setting now in Cthulhu Through the Ages... but this is a valid complaint, IMHO.
Honestly, though... I don't find sci-fi to be the place where BRP-derived systems shine: in combat, modern weapons already render all humans into "mook-level" characters -- mostly we drop in one hit. Not necessarily dead, but hors de combat. And the weapons are only getting more-effective. This isn't the play-space where BRP shows to best advantage, IMHO; it's no worse than d20Modern or other D&D versions, but it doesn't stand out as notably better, either.
Still, given various other products in the extended BRP family, it seems like something Chaosium could look at. A solid sci-fi entry would nicely extend Chaosium's RPG offerings. All they need is time and staff... And/or a freelancer who submits a killer product that Chaosium finds they HAVE to print...

First came the Dragonkill; later, the Dragonrise. I expect there was some element of "srsly? dudes, wtf? r u RLLY gonna PO dragonkind AGAIN? k, whatevs... we r DONE w this shit. FIAT FORMIDO. I'm out. Thanks for the snack, btw..." YGMV, but IMG the Brown Dragon has made it part of the universe that Fear of Dragons is just a common piece of human nature near DP & Tarsh.
IMO it didn't take the Dragonrise to keep fear of dragons alive. The arrival of the Green Dragon north of Arrowmound was a momentous reminder, too, just after humans had begun re-settling Dragon Pass (and it may have stopped further immigration from neighboring regions). The Red and Black Dragons were known for their presence anyway.
And in a purely rational way, awakening the brown dragon before the temple started to bore into its magic might have avoided a much worse eruption of draconic activity. Imagine a glowline powered by draconic energies... the universe might have folded.
There are a couple of such events. The Flood/Deluge may not have been a single event, but the massive loss of formerly ideal living space to rising sea levels has left traumatic memories all over the world, whether it refers to the tsunami of Doggerland, the flooding of the Black Sea Basin or the estuary of Mesopotamia, or the Thera eruption in the Aegaean.
Fallout years or even decades after huge volcanic eruptions with the subsequent mini-ice ages or the black death are other such deeply ingrained scenarios of cataclysms.

Don't you oppress me by telling me that I can't oppress other people and tell what to think and how to play.
(In deference to the fact that e-posts don't convey subtext well - especially when I make them - that's not a dig at or accusation of the OP, it's a straight up piss take)

It does seem to me that BRP is a bit like a religion in that it has schismed repeatedly. What we don't need is purges by fanatics bent on restoring heterodoxy. Though I like the BGB, and would like to see more supplements done for it.

Heck if they buy me that T shirt I'll wear it. Are you reading thic Chaosiumites? I take a Large SIZ. 😉Another company made an awesome Arkham Astronomy Club "The stars are bright" T shirt that I'd love to wear too, hint hint! 👍

One of the buffoons that wrote that paper has been butthurt because of the amount of criticism he has faced. He wrote a hilarious letter to one of his detractors, squidmaster PZ Myers. https://freethoughtblogs.com/pharyngula/2018/05/19/i-just-had-an-idea-for-a-movie-squidnado/#more-50910

It's also worth pointing out...
Many companies have multiple lines/systems. Take EvilHat... mostly Fate, but they also offer Monster of the Week (a PbtA game), and Gumshoe-driven Bubblegumshoe; and even within their Fate line they have multiple variants on sale. Take OnyxPath... mostly Storyteller, but Scarred Lands is D&D (originally d20, now 5e), Pugmire is another D&D-variant, and the "Deimos" system for Cavaliers of Mars. And of course Storyteller has many variants: both WoD & CoD plus Scion, Trinity, Exalted, etc... Etc etc etc. They are all obviously doing the wrong thing.
I think it's an asset to both Chaosium and Glorantha to have both a narrative-centric ruleset like HQ and a crunchy/simulationist ruleset like RQ.
You also missed complaining about 13G: "13th Age in Glorantha" (13th Age is another d20 variant) being the THIRD completely-different gamesystem (alongside RQ and HQ) to run Glorantha.
And in addition to Mythras from TDM, we must also suffer OpenQuest &c from d101, the Renaissance line from C&W, RD100 from Alephtar, MRQ Legend, RDP Q21, d00Lite, GORE, Open Basic, and likely more I've forgotten or overlooked.
The problem is obviously even worse than you thought!
===
Seriously: the stuff that seems to be bothering you is actually a reflection of the strength of BRP and its presence within the overall RPG market.
(And for the record, HQ has both a generic engine (HQ2) and a specific Glorantha version, each as a standalone product.)

Dammit Seneschal, I don't even know where to find those Stayfree-Maxipads! I'm stuck using rugosely squamous and cyclopean R'lyeh Brand slime pads! Also, if Chaosium were to pay me, handsomely to promote BRP I would happily walk around Nottingham dressed as the BGB! 🤣

This.
First came the Dragonkill; later, the Dragonrise. I expect there was some element of "srsly? dudes, wtf? r u RLLY gonna PO dragonkind AGAIN? k, whatevs... we r DONE w this shit. FIAT FORMIDO. I'm out. Thanks for the snack, btw..." YGMV, but IMG the Brown Dragon has made it part of the universe that Fear of Dragons is just a common piece of human nature near DP & Tarsh.
There IS no RW cognate to any historical event. It's now more like the RW fear of spiders, of snakes, etc. Not everyone suffers from it, and even those who do can often overcome it enough to function even around the fear-object... But it's just well-known around DP/Tarsh as a facet of human nature.

What is the approximate page count for the RoH Companion? I would prefer a print copy, it's fun to show off books to my players when pitching campaign ideas.
Also, I really liked the plot of A Message From Furthermost. A classic Star Trek type of adventure. It was nice to see a planet side adventure after the first two mainly involved the classic 'lost ship exploration'. Overall the quality of the three RoH adventures is good, just a matter of variety.

Tut, tut. OF COURSE we want to proselytize and spread BRP like a religion. That's what advertising and marketing and free market capitalism are all about. It's why Chaosium's latest products are all color (All-singing! All-dancing!) all the time. It's why you are a bad dad if you don't buy your kids Little Caesar's Pizza, are uncool if you drink Coke instead of Pepsi, and are downtrodden and unsanitary if you don't use Stay-free Maxipads.
So switch to BRP, the only role-playing system guaranteed to combat unsightly Cthulhu-itis, freshen your Broo, and put the myth back in your characters' mythadventures! Anything less is Ducking your responsibilities as a GM.
"Just the Prax, ma'am. Just the Prax"

Ok, I think I need to reread those contest outcome tables. There's a few of them I believe, but it's a bit difficult seeing them all the same time on a pdf. I think that's the disconnect for me. If I had the hardcopy I could flip back and forth and compare them. Perhaps then I'll see how this all fits.

Then the objective here is really to survive. You could use a lot of abilities to achieve this aim. Certainly, using your fighting skills is one (as is, well, running away). A complete success by using your fighting skill here would definitely include killing the orc, but a lesser level of success might not - your fighting skills could buy you an opportunity/moment to escape, or you could convince your opponent that you're not worth the trouble and the orc lets you escape, etc.

Are you sure it's the God Plane that they're disappearing into? Maybe the creation of Time was all an illusion and mortals are part of an elaborate construct while their real bodies are somewhere else ...

I think that the current trend at Chaosium is promoting RuneQuest, Glorantha and Call of Cthulhu as brands for people to recognize, and not BRP. BRP is the minimum common factor among games, and still a Chaosium trademark, but nothing for which they wish to generate a strong brand loyalty.
As MOB has clarified, it is not dead. However, I do not think that Chaosium wishes anyone to create supplements for the BGB anymore. The latest news we had from them was that they wanted submitted products to contain a core version of the rules, so that they can become stand-alone games. It was the company basic policy in the 80s, and it has been put back into effect. Please note that the previous policy, until 2015, was the exact opposite: you could not include the rules in your game, you had to reference the BGB.
While I agree with you that it is probably the best incarnation of BRP currently in print, you must accept the fact that the BGB is in no way considered a “unifying Bible”. This GURPS-like approach that you seem to prefer is something the current management has always rejected as a bad policy. So it is not just a matter of developers’ preference: the options may simply not be on the table.
You are asking for two things here:
1. Grow the BRP system as a community. You already got some ideas from the community here. However, Chaosium is likely to support your idea only if you leverage the brands which they want to leverage (RuneQuest, Mythic Iceland, Call of Cthulhu…) and not “BRP as a brand”. MOB can perhaps state this more correctly than me.
2. “combat the confusing landscape of BRP offerings”. Now that would be actively try to drive users away from other games that they seem to like. Do you think that the BRP community, which includes plenty of people who prefer other variants, would agree with this ?
I can understand why you write this, and the source of your frustration. But there is a sad fact that you should acknowledge: what you are looking for is legitimate, but against the stated policies of both the owner of the BRP trademark and the other independent producers of BRP “look-alikes”. Asking for people to find a way to counteract this is asking people to counter the plans of the game companies they wish to support. I doubt you can find much support for this idea, regardless of whether you are correct or not.

RuneQuest 3 requires "Contact" with the focus, which can be through any sense : touch, sight or another sense. There's no SR malus if you don't see it, as long as you touch it.
Tattoos and methodical scarring are expressly named as possible foci.

First of all I'm glad that BRP is not just in the hands of one game company any more, and would still be around in some form should ,Cthulhu forbid, Chaosium disappear. Secondly, why should we be burdened with spreading BRP like it is some kind of religion? Surely we're running, or playing, it for entertainment and not because we're proselytisers. Most of us can barely get a game together what with juggling our work and family life, let alone act as spreaders of the faith beyond our usual gaming hours.

But none of these are 500 years ago:
Potato Famine: 1845
American civil war: 1865
battle of Amselfeld/Kosovo: 1389
The site of the battle 600 years later was chosen for the then serbian president's rousing speech, which I personally believe was more to do with good political stage management than an actual historic basis. I don't think you can use the battle of Kosovo as a basis of memory comparison to the dragonkill then to the genocide and wars resulting from the breakup of Yugoslavia. My ancestry from the region dating from the 1850s gives me no traits...